Net Earnings (Loss) Per Share - Calculation of Basic and Diluted Net Earnings (Loss) Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Numerator:
Net income (loss) attributable to Carvana Co. - basic		$ 22	$ (41)	$ (14)	$ (101)
Income impact of assumed conversions from LLC Units		23	0	0	0
Net income (loss) attributable to Carvana Co. - diluted		$ 45	$ (41)	$ (14)	$ (101)
Denominator:
Weighted-average shares of Class A common stock outstanding - basic (in shares)			66,327	79,751	58,363
Class A Common Stock
Denominator:
Weighted-average shares of Class A common stock outstanding (in shares)		81,439	66,430	79,795	58,493
Weighted-average shares of Class A common stock outstanding - basic (in shares)	[1]	81,398	66,327	79,751	58,363
Dilutive potential Class A common shares:
Weighted-average shares of Class A common stock outstanding - diluted (in shares)		176,015	66,327	79,751	58,363
Net earnings (loss) per share of Class A common stock - basic (in dollars per share)		$ 0.27	$ (0.62)	$ (0.18)	$ (1.73)
Net earnings (loss) per share of Class A common stock - diluted (in dollars per share)		$ 0.26	$ (0.62)	$ (0.18)	$ (1.73)
Class A Common Stock | Options
Dilutive potential Class A common shares:
Dilutive potential Class A common shares (in shares)		835	0	0	0
Class A Common Stock | Restricted Stock Units and Awards
Dilutive potential Class A common shares:
Dilutive potential Class A common shares (in shares)		420	0	0	0
Class A Common Stock | Class A Units
Dilutive potential Class A common shares:
Dilutive potential Class A common shares (in shares)		91,078	0	0	0
Class A Common Stock | Class B Units
Dilutive potential Class A common shares:
Dilutive potential Class A common shares (in shares)		2,284	0	0	0
Class A Common Stock | Restricted Stock
Denominator:
Nonvested weighted-average restricted stock awards (in shares)		(41)	(103)	(44)	(130)

[1] Weighted-average shares of Class A common stock - basic - outstanding have been adjusted for unvested restricted stock awards.